Just to clarify, I'll repeat those four guides I suggested. I'm not aware of anything special about a DS Lite that would make any of these less applicable to your case. Of course if your device is still under warranty, get them to fix it. Otherwise, try these:

I presume a cell phone. The purpose of the color-changing sticker is to let the phone company blame you for the accident, rather than replacing it under warranty. If you already know your warranty is void, then there is no harm in trying to save the phone yourself.
(In the future, I would suggest using more capital letters, punctuation, and important details when asking something on Answers.)